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Sinclair licensed the Spectrum design to Timex Corporation in the United States.

An enhanced version of the Spectrum with better sound, graphics and other modifications was marketed in the USA by Timex as the Timex Sinclair 2068.

Timex's derivatives were largely incompatible with Sinclair systems.

However, some of the Timex innovations were later adopted by Sinclair Research.

A case in point was the abortive Pandora portable Spectrum, whose ULA had the high resolution video mode pioneered in the TS2068.

Pandora had a flat-screen monitor and Microdrives and was intended to be Sinclair's business portable.

After Amstrad bought the computer business of Sinclair Research, Sir Clive retained the rights to the Pandora project, and it evolved into the Cambridge Computer Z88, launched in 1987.